<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        function fn(prev, current) {
            return prev + current;
        }
        Array.prototype.myReduce = function (getNext, initValue) {
            for (const item of this) {
                initValue = getNext(initValue, item);
            }
            return initValue;
        }
        
        const str = 'name=zhangsan&age=18&sex=男';
        // 1. ['name=zhangsan', 'age=18', 'sex=男']
        const res = str.split('&').myReduce((prev, current) => {
            // current: 'age=18'
            // prev: { name: 'zhangsan' }
            const arr = current.split('=');
            const key = arr[0];
            const value = arr[1];
            prev[key] = value;
            return prev;
        }, {});
        console.log(res);
    </script>
</body>
</html>